130 Interest of tricuspid annular displacement “TAD” in evaluation of right ventricular ejection fraction

The ultrasound assessment of right ventricular (RV) function is often sub-optimal. The range of excursions of the mitral or tricuspid annulus measured in mm by 2D or TM mode echocardiography has been shown to reflect the systolic function of both ventricles. Methods We studied a new technique based on a tissue tracking algorithm that is ultrasound beam angle independent for automated detection of tricuspid annular displacement (TAD) (QLAB, Philips Medical Imaging). Twenty six patients (pts) with pulmonary arterial hypertension (n= 13), heart failure (n= 9), valvulopathy (n= 3) or myocarditis (n= 1) were reffered for magnetic resonance imaging (MRI) and underwent a complete transthoracic echocardiography (TTE). MRI was performed on a 1.5 T MR scanner. MRI RV ejection fraction (RVEF) was correlated by linear regression with TAD, peak systolic tricuspid annular velocity (Sa) and RV fractional area change (FAC). Sixteen pts (61.5%) exhibited right ventricular systolic dysfunction (RVEF Results In the pts group, MRI RVEF was positively correlated with TAD (R 2 = 0,65; p 2 = 0,56; p 2 = 0,39 p=0,0025). The strongest relation was observed with TAD. A value of TAD 2 =0,36 ; p Limitations The echocardiographic and MRI parameters were not obtained simultaneously but at an interval of 24 hours. Our study is the first to correlate TAD with MRI RVEF. We conclude that TAD provides a simple, rapid, and non-invasive tool for assessing right ventricular systolic function.